Canon USA described the design of the EF 85mm f/1.4L IS USM Lens to most-closely resemble that of the last-released L-Series prime, the EF 35mm f/1.4L II USM Lens. And, that description appears right, especially when looking at the product images. Basically, to the 35 L II, add .3" (8.2mm) to the diameter and 6.7 oz (190g) to get the 85 L IS.
For example, Canon has a couple of versions of the 16-35mm focal length, and each takes filters of a different diameter. Prime Lenses: EF 14mm f/2.8L II USM: Rear The Canon EF 85mm f/1.4L IS USM lens slots into Canonβs range of fast medium telephoto primes between the EF 85mm f/1.8 USM (Β£325), and EF 85mm f/1.2 L II USM (Β£1765). Manufacturer β : β Canon. ASIN β : β B014EOML6S. Item model number β : β 9523B002. Manufacturer β : β Canon. Item Weight β : β 759 g. Item Dimensions LxWxH β : β 10.5 x 8.1 x 8.1 Centimeters. Included Components β : β Warranty, Canon EF 35mm f/1.4L II USM Lens, LP1219 Soft Lens Case, E-72 II 72mm Lens Cap, Lens Dust ef16-35mm f4 l is usm. γΊγΌγ . γͺγΌγγ³δΎ‘ζ Ό. εΊθ§; efγγ¦γ³γ; θ£½εθ©³η΄°γΈ; ef24-70mm f2.8 l ii usm. ef-s10-22mm f3.5-4.5 usm. P59n. 240 286 424 205 468 28 417 98 408